For a gas well the flow versus the differenceof the squares of the average reservoir and wellbore pressures are plotted on log-log paper.
对于气井，在双对数坐标纸上绘出流量对平均储层压力与井筒压力平方差的关系图。
2
A necessary and sufficient condition for nonlinear systems to achieve optimal regulator is given by using the return difference condition and completion of the squares argument.
利用返回差条件，借助配方方法讨论非线性系统达到最优调节所必须满足的充要条件。
3
According to the shifted distance and the phase increment, the mapping relationship between phase difference and depth of object can be determined by a least squares method.